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The purpose of this report is to document the present status of the studies of the performance of
the ATLAS trigger. The studies are driven by the physics goals that have to be achieved in the
high-rate environment of the LHC. They cover the level-1 trigger (LVL1), the level-2 trigger
(LVL2) and the event filter (EF), aiming at an overall optimization of the decision chain. For
LVL1 the technical design report, covering both the muon and the calorimeter systems, has been
submitted, and final hardware decisions are imminent. For LVL2 and the EF a progress re-port
and workplan are presented in; this will be followed by a technical proposal at the
end of 1999. Consequently the results presented in this report are most advanced for LVL1. For
LVL2, possible algorithms and tentative selection criteria are presented in the context of a de-tailed
discussion on trigger objects and rates, to guide the choice of architecture and help clarify
the role of LVL2 with respect to the EF. For the EF itself, which is expected to use offline-like re-construction
algorithms, the discussion is largely limited to functional requirements.
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